Understanding Regular Expressions RegEX Javascript

On 04/02/2025

Understanding Regular Expressions (RegEX) in JavaScript

Regular expressions (RegEX) in JavaScript are a powerful tool for searching and manipulating strings. They allow you to define complex search patterns and apply them to text strings. Here is a detailed explanation of how they work:

1. Creating a Regular Expression

In JavaScript, you can create a regular expression in two ways:

Literal: Using slashes /.
RegExp Object: Using the RegExp constructor.

Literal Example:

let regex = /pattern/;

RegExp Object Example:

let regex = new RegExp("pattern");

2. Using Regular Expressions

Regular expressions can be used with several string methods and RegExp object methods.

String Methods:

search(): Searches for a match and returns the index of the first occurrence.
match(): Searches for all matches and returns an array of results.
replace(): Replaces matches with another string.
split(): Splits a string into an array based on matches.

RegExp Object Methods:

test(): Checks if a string contains a match.
exec(): Searches for a match and returns an array of information about the match.

3. Practical Examples

Search for a Match:

let str = "Hello, world!"; let regex = /world/; let result = str.search(regex); // Returns 7

Find All Matches:


let str = "Hello, world! Hello, everyone!"; 
let regex = /Hello/g; // The 'g' flag means global, to find all occurrences 
let result = str.match(regex); // Returns ["Hello", "Hello"]

Replace Matches:

let str = "Hello, world!"; let regex = /world/; let result = str.replace(regex, "universe"); // Returns "Hello, universe!"

Split a String:

let str = "one,two,three"; let regex = /,/; let result = str.split(regex); // Returns ["one", "two", "three"]

Test for a Match:

let str = "Hello, world!"; let regex = /world/; let result = regex.test(str); // Returns true

Use exec():

let str = "Hello, world!"; let regex = /world/; let result = regex.exec(str); // Returns ["world", index: 7, input: "Hello, world!", groups: undefined]

4. Flags

Regular expressions can include flags to modify their behavior:

i: Case-insensitive.
g: Global search (find all occurrences).
m: Multi-line mode (treat each line separately).
s: DotAll mode (the dot . matches newlines).
u: Unicode mode.
y: Sticky mode (search from the lastIndex position).

Example with Flags:

let regex = /hello/i; // Case-insensitive let result = regex.test("Hello"); // Returns true

5. Search Patterns

Regular expressions allow you to define complex patterns:

^: Start of the string.
$: End of the string.
.: Any character except a newline.
\d: A digit.
\w: An alphanumeric character.
\s: A whitespace character.
*: Zero or more occurrences of the preceding pattern.
+: One or more occurrences of the preceding pattern.
?: Zero or one occurrence of the preceding pattern.
{n}: Exactly n occurrences of the preceding pattern.
{n,m}: Between n and m occurrences of the preceding pattern.

Complex Pattern Example:


let regex = /^\d{3}-\d{2}-\d{4}$/; // Matches a US Social Security Number 
let result = regex.test("123-45-6789"); // Returns true

Conclusion

Regular expressions in JavaScript are a powerful tool for manipulating strings. They allow you to define complex search patterns and apply them to text strings flexibly and efficiently. By mastering search patterns and associated methods, you can accomplish advanced text processing tasks.

javascript

In javascript

Sharepoint List get list fields in console

On 20/02/2025


function getUrlParams() {
  const params = new URLSearchParams(window.location.search);
  const urlParams = {};
  for (const [key, value] of params.entries()) {
    urlParams[key] = value;
  }
  return urlParams;
}
async function getSharePointListFields(listId) {
  const apiUrl = `${_spPageContextInfo.webAbsoluteUrl}/_api/web/lists(guid'${listId}')/fields?$select=InternalName&$orderby=InternalName&$filter=Hidden eq false`;

  try {
    const response = await fetch(apiUrl, {
      method: 'GET',
      headers: {
        'Accept': 'application/json;odata=verbose',
        'Content-Type': 'application/json;odata=verbose',
      },
      credentials: 'include', // Include credentials for authenticated requests
    });

    if (!response.ok) {
      throw new Error('Network response was not ok');
    }

    const data = await response.json();
    return data.d.results;
  } catch (error) {
    console.error('Error fetching SharePoint list fields:', error);
    return [];
  }
}
// Usage
const urlParams = getUrlParams();
const listId = urlParams.List;
window.Fields = "";
if (listId) {
  getSharePointListFields(listId).then((fields) => {
    console.log('SharePoint List Fields:', fields);
    // Process the fields as needed
	fields.map((f) => {
	window.Fields += `${f.InternalName}\n`;
		
	});
    console.log(window.Fields);
  });
} else {
  console.error('List ID not found in URL parameters');
}

In javascript

SharePoint Get All Documents Permissions

On 13/12/2024

Get all RoleAssignments from a document library even more than 5000 elements

only when HasUniqueRoleAssignments == true


let currentSort = { column: null, direction: 'asc' }; // Store the current sort state

// Creates the style element
function createStyleElement(id, content) {
    var style = document.createElement("style");
    style.type = "text/css";
    style.id = id;
    style.innerHTML = content;

    if (style.styleSheet) {
        style.styleSheet.cssText = content;
    } else {
        let st = document.getElementById(id);
        if (st == undefined) {
            var head = document.head || document.getElementsByTagName("head")[i];
            head.appendChild(style);
        } else {
            st.innerHTML = content;
        }
    }
    return style;
}


// Function to filter the table based on dropdown selection
function filterTable(columnIndex, value) {
    let table, tr, td, i, select, selectedValue, txtValue;
    table = document.querySelector("table");
    tr = table.getElementsByTagName("tbody")[0].getElementsByTagName("tr");
    select = table.getElementsByTagName("select")[columnIndex];
    //debugger;
    selectedValue = value;

    // Loop through all table rows and hide those that don't match the filter
    for (i = 0; i < tr.length; i++) {
        td = tr[i].getElementsByTagName("td")[columnIndex];
        if (td) {
            txtValue = td.textContent || td.innerText;
            if (selectedValue === "" || txtValue === selectedValue) {
                tr[i].style.display = "";
            } else {
                tr[i].style.display = "none";
            }
        }
    }
}
function sortTable(columnIndex, direction) {
    let table, rows, switching, i, x, y, shouldSwitch;
    table = document.querySelector("table");
    switching = true;
    let tbody = table.querySelector("tbody");

    // Set the current sort state
    currentSort.column = columnIndex;
    currentSort.direction = direction;

    while (switching) {
        switching = false;
        rows = tbody.rows;

        for (i = 0; i < rows.length - 1; i++) {
            shouldSwitch = false;
            x = rows[i].getElementsByTagName("td")[columnIndex];
            y = rows[i + 1].getElementsByTagName("td")[columnIndex];
            let isNumber = false;


            if (!isNaN(x.innerHTML)) {

                // Check if rows should switch based on ascending or descending order
                if (direction === 'asc') {
                    if (parseFloat(x.innerHTML) > parseFloat(y.innerHTML)) {
                        shouldSwitch = true;
                        break;
                    }
                } else if (direction === 'desc') {
                    if (parseFloat(x.innerHTML) < parseFloat(y.innerHTML)) {
                        shouldSwitch = true;
                        break;
                    }
                }
            }
            else {
                // Check if rows should switch based on ascending or descending order
                if (direction === 'asc') {
                    if (x.innerHTML.toLowerCase() > y.innerHTML.toLowerCase()) {
                        shouldSwitch = true;
                        break;
                    }
                } else if (direction === 'desc') {
                    if (x.innerHTML.toLowerCase() < y.innerHTML.toLowerCase()) {
                        shouldSwitch = true;
                        break;
                    }
                }
            }
        }
        if (shouldSwitch) {
            rows[i].parentNode.insertBefore(rows[i + 1], rows[i]);
            switching = true;
        }
    }
}
// Function to generate the table
function generateTableFromJson2(jsonArray, select, addHeaders = true) {
    const style = `
    table {
            width: 100%;
            border-collapse: collapse;
        }

        th, td {
            padding: 8px 12px;
            text-align: left;
            border: 1px solid #ddd;
        }

        tbody tr{
           max-height: 15px;
        }

        th {
            background-color: #f4f4f4;
            color: #000;
        }

        /* Scrollable table wrapper */
        .table-wrapper {
            max-height: 800px;
            overflow-y: auto;
            border: 1px solid #ddd;
        }
        /* Style for dropdowns in header */
        select {
            width: 100%;
            padding: 4px;
            margin-top: 5px;
        }

        /* Style for the sorting arrows */
        .sort-arrows {
            cursor: pointer;
            margin-left: 5px;
        }    
        `;
    createStyleElement("fdiStyle", style);

    // Create table element
    let table = document.createElement('table');

    // Create table header
    let header = table.createTHead();
    let headerRow = header.insertRow(0);

    // Get keys (headers) from the first object in the JSON array
    //let keys = Object.keys(jsonArray[0]);
    let keys = select.split(",");
    if (addHeaders) {
        keys.forEach((key, index) => {
            if (key !== "__metadata") {

                let th = document.createElement('th');
                th.innerHTML = key;

                // Create a dropdown (select) for filtering
                let select = document.createElement('select');

                select.addEventListener('change', function () {
                    const selectedValue = select.value;
                    filterTable(index, selectedValue);
                });

                // Populate dropdown with unique values from the JSON data
                let uniqueValues = [...new Set(jsonArray.map(item => item[key]))];

                // Add a default "All" option for no filter
                let optionAll = document.createElement('option');
                optionAll.value = "";
                optionAll.text = `All`;
                select.appendChild(optionAll);

                // Create an option for each unique value
                if (typeof (uniqueValues[0]) === typeof (1)) {
                    const pp = uniqueValues.sort((a, b) => {
                        if (a < b) {
                            return -1;
                        }
                        if (a > b) {
                            return 1;
                        }
                        return 0;
                    });
                    pp.forEach(value => {
                        let option = document.createElement('option');
                        option.value = value;
                        option.text = value;
                        select.appendChild(option);
                    });
                } else
                    uniqueValues.sort().forEach(value => {
                        let option = document.createElement('option');
                        option.value = value;
                        option.text = value;
                        select.appendChild(option);
                    });
                // Sort arrows for sorting the columns
                let upArrow = document.createElement('span');
                upArrow.innerHTML = '⬆️';
                upArrow.classList.add('sort-arrows');
                upArrow.onclick = () => sortTable(index, 'asc');

                let downArrow = document.createElement('span');
                downArrow.innerHTML = '⬇️';
                downArrow.classList.add('sort-arrows');
                downArrow.onclick = () => sortTable(index, 'desc');

                th.appendChild(select);  // Append the dropdown to the header
                th.appendChild(upArrow);  // Append the dropdown to the header
                th.appendChild(downArrow);  // Append the dropdown to the header
                headerRow.appendChild(th);
            }
        });
    }

    // Create table body and populate rows with data
    let tbody = document.createElement('tbody');
    jsonArray.forEach((item) => {
        let row = tbody.insertRow();
        keys = select.split(",");
        keys.forEach((key) => {
            let cell = row.insertCell();
            if (key !== "__metadata") {
                cell.setAttribute("nowrap", "nowrap");
                if (key === "RoleDefinitionBindings") {
                    cell.appendChild(generateTableFromJson2(item.RoleDefinitionBindings.results, "Name,Id", false));
                } else if (key.indexOf("/") > 0) {
                    cell.innerHTML = item[key.split("/")[0]][key.split("/")[1]]
                } else
                    cell.innerHTML = item[key];  // Insert each value from the JSON into the table cell
            }
        });
    });

    // Append the body to the table
    table.appendChild(tbody);


    return table;
}

function removeSlasches(select, datas) {
    const ret = [];
    const fields = select.split(',');
    for (let i = 0; i < datas.length; i++) {
        const toAdd = {};

        for (let j = 0; j < fields.length; j++) {
            if (fields[j].indexOf('/') > 0) {
                const splitted = fields[j].split('/');
                toAdd[splitted.join('')] = datas[i][splitted[0]][splitted[1]];
            } else
                toAdd[fields[j]] = datas[i][fields[j]];
        }
        ret.push(toAdd);
    }
    console.log("removeSlasches", ret);
    return ret;
}

async function GetPermissionsInFolder(siteUrl, listUrl1, query) {
    // Fetch options with headers for authentication and response format
    const fetchOptions = {
        method: 'GET',
        headers: {
            'Accept': 'application/json;odata=verbose'
        }
    };

    //get web relativeUrl
    var req = `${siteUrl}/_api/web?$select=ServerRelativeUrl`;
    const webServerRelativUrl = (await (await fetch(req, fetchOptions)).json()).d.ServerRelativeUrl;

    let query1 = "";
    if (`${query}`.trim() !== "") {
        query1 = `&$filter=${query}`;
        query = ` and ${query}`;
    }
    //get firstId
    req = `${siteUrl}/_api/web/getlist('${webServerRelativUrl}/${listUrl1}')/items?$select=Id&$top=1&$orderby=Id asc`;
    console.log("req", req);
    const firstId = 0;//(await (await fetch(req, fetchOptions)).json()).d.results[0].Id;
    console.log("firstId", firstId);
    //get lastId
    //req = `${siteUrl}/_api/web/getlist('${webServerRelativUrl}/${listUrl1}')/items?$select=Id&$filter=Id gt 170 and Id lt 533&$top=1&$orderby=Id desc`;
    req = `${siteUrl}/_api/web/getlist('${webServerRelativUrl}/${listUrl1}')/items?$select=Id&$top=1&$orderby=Id desc`;
    console.log("last", req);
    const lastId = (await (await fetch(req, fetchOptions)).json()).d.results[0].Id;
    console.log("lastId", lastId);


    let startId = firstId;
    let endId = firstId + 5000;
    var allItems = [];

    console.log(`startId ${startId} endId ${endId} lastId ${lastId}`)
    console.log("query", query);
    do {
        var select = "?$select=FileDirRef,RoleAssignments,HasUniqueRoleAssignments,Id,Title,FileLeafRef,Modified,Created";
        req = `${siteUrl}/_api/web/getlist('${webServerRelativUrl}/${listUrl1}')/items${select}&$filter=Id ge ${startId} and Id lt ${endId}${query}&$orderby=Id asc&$top=5000`;
        console.log("req", req);
        // Send the asynchronous GET request to the REST API endpoint
        var respList1 = await fetch(req, fetchOptions);
        const items = (await respList1.json()).d.results;

        //get only items with unique permissions
        const withUniquePermissions = items.filter(user => user.HasUniqueRoleAssignments);

        console.log("withUniquePermissions", withUniquePermissions.length);
        allItems.push(...withUniquePermissions);
        startId += 5000;
        endId += 5000;
        console.log(`startId ${startId} endId ${endId} lastId ${lastId}`)
    }
    while (endId < lastId);

    return allItems;
}

async function batchFetchPermissions(siteUrl, itemIds, listUrl1) {
    const batchBoundary = "batch_" + new Date().getTime();
    const fetchOptions = {
        method: 'GET',
        headers: {
            'Accept': 'application/json;odata=verbose'
        }
    };
    const webServerRelativUrl = (await (await fetch(`${siteUrl}/_api/web?$select=ServerRelativeUrl`, fetchOptions)).json()).d.ServerRelativeUrl;
    const batchBody = itemIds.map((item) => {
        return `
--${batchBoundary}
Content-Type: application/http
Content-Transfer-Encoding: binary

GET ${siteUrl}/_api/web/getlist('${webServerRelativUrl}/${listUrl1}')/items(${item.Id})/RoleAssignments?$expand=Member,RoleDefinitionBindings HTTP/1.1
`;
    }).join("\n") + `\n--${batchBoundary}--`;
    const digest = await GetDigestValue(siteUrl);//
    //console.log("digest", digest);
    const headers = {
        Accept: "application/json;odata=verbose",
        "X-RequestDigest": digest,
        "Content-Type": `multipart/mixed; boundary="${batchBoundary}"`,
    };

    console.log("itemIds", itemIds.length);
    const response = await fetch(`${siteUrl}/_api/$batch`, {
        method: "POST",
        headers,
        body: batchBody,
    });

    const text = await response.text(); // Parse response manually (multipart)
    return parseBatchResponse(text, itemIds);
}

async function GetDigestValue(siteUrl) {//
    const fetchOptions = {
        method: 'POST',
        headers: {
            'Accept': 'application/json;odata=verbose',
            'Content-type': 'application/json;odata=verbose'
        }
    };

    const response = await fetch(siteUrl + "/_api/contextinfo", fetchOptions);
    return (await response.json()).d.GetContextWebInformation.FormDigestValue;
}


function nodeParser2(xml) {

    var parser = new DOMParser();
    var doc = parser.parseFromString(xml, "application/xml");

    // Define a namespace resolver
    var nsResolver = function (prefix) {
        var ns = {
            'atom': 'http://www.w3.org/2005/Atom',
            'd': 'http://schemas.microsoft.com/ado/2007/08/dataservices',
            'm': 'http://schemas.microsoft.com/ado/2007/08/dataservices/metadata',
            'georss': 'http://www.georss.org/georss',
            'gml': 'http://www.opengis.net/gml'
        };
        return ns[prefix] || null;
    };

    // Use the namespace resolver in the XPath evaluation
    var result = doc.evaluate('/atom:feed/atom:entry', doc, nsResolver, XPathResult.ANY_TYPE, null);

    var entries = [];
    var entry = result.iterateNext();
    while (entry) {
        // Check if the entry contains a category with term="SP.User"
        var category = entry.getElementsByTagNameNS('http://www.w3.org/2005/Atom', 'category');
        let userName = "";
        let permissions = [];
        for (var i = 0; i < category.length; i++) {//
            if (category[i].getAttribute('term') === 'SP.User') {
                // Get the d:Email value
                let email = entry.getElementsByTagNameNS('http://schemas.microsoft.com/ado/2007/08/dataservices', 'Email');

                if (email.length > 0 && email[0].textContent.trim() !== "") {
                    userName = email[0].textContent;//
                } else {
                    email = entry.getElementsByTagNameNS('http://schemas.microsoft.com/ado/2007/08/dataservices', 'Title');
                    userName = email[0].textContent;//
                }
            }
            else if (category[i].getAttribute('term') === 'SP.Group') {
                // Get the d:Email value
                let email = entry.getElementsByTagNameNS('http://schemas.microsoft.com/ado/2007/08/dataservices', 'Email');

                if (email.length > 0 && email[0].textContent.trim() !== "") {
                    userName = email[0].textContent;//
                } else {
                    email = entry.getElementsByTagNameNS('http://schemas.microsoft.com/ado/2007/08/dataservices', 'Title');
                    userName = email[0].textContent;//
                }
            }
            else if (category[i].getAttribute('term') === 'SP.RoleDefinition') {
                var Name = entry.getElementsByTagNameNS('http://schemas.microsoft.com/ado/2007/08/dataservices', 'Name');
                if (Name.length > 0) {
                    permissions.push(Name[0].textContent);
                }
            }
        }

        if (userName === "") {
            debugger;
        }
        entries.push({
            "userName": userName,
            "permissions": permissions,
        });
        entry = result.iterateNext();
    }

    //console.log("entries:", entries);
    return entries;
}

// Helper to parse batch responses
function parseBatchResponse(responseText, itemIds) {
    //console.log("responseText", responseText);
    var results = [];
    const parts = responseText.split("--batchresponse");

    let i = 0;
    for (const part of parts) {
        if (part.includes("HTTP/1.1 200 OK")) {
            const xmlStart = part.indexOf("");
            if (xmlStart > -1 && xmlEnd > -1) {
                let xmlString = part.substring(xmlStart, xmlEnd + 8);
                results.push({
                    "item": itemIds[i],
                    "permissions": nodeParser2(xmlString)
                })
                i++;
            }
        }
    }

    return results;
}
function chunkArray(array, chunkSize) {
    let result = [];
    for (let i = 0; i < array.length; i += chunkSize) {
        // Utilise slice pour découper le tableau
        result.push(array.slice(i, i + chunkSize));
    }
    return result;
}


const siteUrl = _spPageContextInfo.webAbsoluteUrl || "https://test.sharepoint.com/sites/BIPvvvv";
const withUniquePermissions = await GetPermissionsInFolder(siteUrl, "Shared%20Documents", "");
//"startswith(FileDirRef, '/sites/BIPvvvv/Shared%20Documents/General/07%20-%20Release%201')"
console.log("withUniquePermissions", withUniquePermissions);
console.log("withUniquePermissions length", withUniquePermissions.length);

const permmissionItemsAll = [];
if (withUniquePermissions.length > 0) {
    const withUniquePermissionsCutted = chunkArray(withUniquePermissions, 30);
    for (let i = 0; i < withUniquePermissionsCutted.length; i++) {
        //debugger;
        const permmissionItems = await batchFetchPermissions(siteUrl, withUniquePermissionsCutted[i], "Shared%20Documents");
        permmissionItemsAll.push(...permmissionItems)

    }
    console.log("permmissionItems", permmissionItemsAll);
}

//FileDirRef,RoleAssignments,HasUniqueRoleAssignments,Id,Title,FileLeafRef,Modified,Created
const toDisplay = [];
let csv = "Id;Title;Modified;Created;UserPermission;Permissions;FileLeafRef;FileDirRef\n";
for (let i = 0; i < permmissionItemsAll.length; i++) {
    const permmissionItem = permmissionItemsAll[i];
    for (let j = 0; j < permmissionItem.permissions.length; j++) {
        for (let k = 0; k < permmissionItem.permissions[j].permissions.length; k++) {
            //debugger;
            const item = {
                "Id": permmissionItem.item.Id,
                "FileDirRef": permmissionItem.item.FileDirRef,
                "HasUniqueRoleAssignments": permmissionItem.item.HasUniqueRoleAssignments,
                "Title": permmissionItem.item.Title,
                "FileLeafRef": permmissionItem.item.FileLeafRef,
                "FileDirRef": permmissionItem.item.FileDirRef,
                "Modified": permmissionItem.item.Modified,
                "Created": permmissionItem.item.Created,
                "UserPermission": permmissionItem.permissions[j].userName,
                "Permissions": permmissionItem.permissions[j].permissions[k]
            }
            csv += `${item.Id};${item.Title};${item.Modified};${item.Created};${item.UserPermission};${item.Permissions};${item.FileLeafRef};${item.FileDirRef}` + "\n";
            toDisplay.push(item);
        }
    }
}

document.body.innerHTML = `<div id="tableContainer" class="table-wrapper"></div>`;

const table = generateTableFromJson2(toDisplay, "Id,Title,Modified,Created,UserPermission,Permissions,FileLeafRef,FileDirRef");

console.log("csv", csv);

// Append the table to the container

document.getElementById('tableContainer').appendChild(table);

navigator.clipboard.writeText(csv);

★ ★ ★ ★ ★

No ratings yet - be the first to rate this.